Oil-guard for commutators.



R. SIEGFRIED. 01L GUARD FOR GOMMUTATORS.

'-' N FILE i Patented Jan. 17,1911.

v 1 1 1 n v u UNITED STATES PATENT OFFICE.

ROBERT. SIEGFBIED, OF PITTSBURG, PENNSYLVANIA, A SSIGNOR TO WESTINGHOUSE ELECTRIC 8c MANUFACTURING COMPANY, A CORPORATION OLE PENNSYLVANIA.

OIL-GUARD FOR COMMUTATORS.

981,803. Specification of Iletwslatent- Patented Jan. 17, 1911..

Application filed October 3, 1995. Serial No. 281,204.

To all whom it may concern. the rotary member of a dynamo-electric ma- Be it known that I, ROBERT Smornmn, a chine having a commutator and its spider citizen of the United States, and a resident constructed in accordance with my invenof Pittsburg, in the county of Allegheny tion.

and State of Pennsylvania, have invented Referring to the drawing, an armatureanewanduseful Improvementin Oil-Guards spider l is mounted upon a shafb 2 and is for Commutators, of which t-he'following is provided with a magnctizable core 2 and a specification. with a cylindrical surface 3 upon which a My invention relates to dynamo-electric plurality of commutator segments may be 10 machines and particularly to commutators mounted. The surface 3 is provided in the for relatively large machines which may be usual manner with a V-shaped clamping direct-connected to the driving engines. ring 4, which engages a complementary V- ,The objectof my invention is to provide shaped groove 5 in a plurality of assembled means for effectively preventing lubricating commutator bars 6. The outerend of the 5 fluids from working into the commutator commutator bars are engaged by a similar from the shaft bearings, that shall be simple V-sha ed ring 7 which is mounted u on a and inexpensive in construction and integral cylinc rical proj ection 8, that is integra with with the commutator spider. the rim of the spider 1 and concentric with It is desirable to specially protcctcommutathe surface 3 The commutator bars are 20 tor ring joints in order to prevent oil from insulated from the V-shaped rings in the working into the commutator, since the apusual manner by interposed insulating rings plication of such fluids produces deteriora- 9 and 10. The V-shaped ring 7 is fitted to tion of its insulation. This is particularly a cylindrical surface 11 of the projection 8 true in-large machines which are direct conand is clamped in position by a plurality of 25 nectcd to driving engines with which a conbolts 12 which are parallel to the axis of the 30 siderable quantity of lubricating fluid is shaft 2, are equally disposed about the ring used. For large machines of thls type, it 7 and hold the ring in firm engagement has been usual heretofore to utilize.comwith the commutator segments.

i mutator rings that were provided with an- The cylindrical projection 8 extends be 30 nular projections which were fitted "within yond the heads of the bolts 12 and is prothe rim of the commutator spider, the rings "'vided with a relatively small annular pro being fastened in position by a plurality of jcction 13 which serves toprcvcnt any luhrilongitudinal bolts. W'ith this arrangement, eating fluid which may have worked from oil was often forced by centrifugal action the bearing to this point from being thrown 35 through the joint between the ring and the onto the joint between the ring 7 and its supspider into the commutator. Y porting surface 11. The outer surface 14 of To avoid the objectionable features in the the ring is of such shape, having its greataforesaid construction of the prior art, I e'st radius at a point farthest from the center have provided a concent-ricannular projection lane of the commutator, that the 011 which 40 on one end of the cylindrical bushing upon is thrown from the projection 13 tends to which the commutator bars are assembled follow the surface 1a to the outer edge of that is provided with an oil diverter which the ring, where a projection 15, that corre- 7 throws off any oil which may work from the sponds to the PIOJBCtIOIl, 1'3, finally diverts bearing onto the rim of the spider. This the oil from the commutator as It l thrown 45 projection is of such length that the oil is away from the shaft by reason of centrifugal thrown against the outer surface of the force. In order to prevent any o l wh ch commutator ring, from which it tends to may be on the surface 14 when themachme creep up to the point farthest removed from is rought to rest from working into the the center of the shaft, which is the outer oint between thermg 7 and the surface 14, rim of the ring, and asecond oil diverter is it is advlsablcvto interpose a ring lti of some formed on the ring at this point,-from which suitable pack ng material such as oakum. the oil is finally thrown away from the com- My invent-ion may obvlously be applied mutator. to a commutator which is mounted on a sepa- The single figure of the accompanyin rate spider from that of the armature and 55 drawing is a sectional view of one h If 0% I desire that all variations in size, form and arrangementof details which effect. similar ta cylindrical rim provided with an external results shall be included within its scope.

I claim as my invention:

1. In a dynmno-electrie nmchine, the com-- bination with a comn'mtator cylinder comirising a plurality of radial bars or segments, :1 commutator spider having at cylindrical rim member on which the bars or segments are mounted. and & commutator clamping ring bolted thereto, of an integral annular prqection of the cylindrical rim. extending outwardly in an axial direction beyond the'bolts by which said clumping ring is fastened in position.

2. In a dynamo-electric machine, the combination with a commutator spider having vannular pro'eetion near its extremity for diverting lu rieating fluid from the cornmutator, of a plurality of commutator segments mounted upon said rim, and a V- sha ied clamping ring having an external annular projection for diverting lubricating fluid.

In testimony whereof, I have hereunto subscribed my name this 27th day of September, 1905.

ROBERT SIEGFRIED. I

Witnesses:

Orro S. SonAniEn. 15mm :HINES who J 

